Influence of oxygen doping on critical fields in MgB2 bulk superconductors

International Cryogenic Materials Conference 2017

Zhang, D.^1 ; Li, X.^1 ; Wan, F.^1 ; Thong, C.J.^2 ; Rindfleisch, M.A.^2 ; Tomsic, M.J.^2 ; Sumption, M.D.^1 ; Collings, E.W.^1

Center for Superconducting and Magnetic Materials, Department of Materials Science and Engineering, Ohio State University, Columbus

OH

43210, United States^1

Hyper Tech Research Incorporated, Columbus

OH

43212, United States^2

关键词: Bulk samples;    Control samples;    Critical fields;    Influence of oxygen;    Magnetization temperature;    MgB2 powders;    Mixed powder;    Temperature range;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/279/1/012025/pdf
DOI  :  10.1088/1757-899X/279/1/012025

来源: IOP

【 摘 要 】

In this work we studied the influence of SnO2doping on the critical fields and temperatures of MgB2bulk samples. Bulk samples were made by mixing ex-situ MgB2powder with 5 wt% SnO2powder and then pressing the mixed powders into pellets using a pressure of 2000 psi. The bulk pellets were sintered at 900°C in a furnace under flowing Ar. The samples were quenched to room temperature after dwelling at 900°C for 5h. XRD, SEM, and magnetic measurements were made on doped and control samples. XRD showed a decomposition of the SnO2and very slight reductions in the a-axis and c-axis lattice parameters of the MgB2phase. M-T (Magnetization-Temperature) curves showed a decrease in Bc2of approximately 1 T in the temperature range of 24 K - 39 K with SnO2additions as compared to the control samples.